To test for Free (non chelated) iron
1) Take 5ml sample of water
2) Add 3 drops or Reagent #1. Cap & Shake.
3) Wait 1 min.
4) match colour to chart.
5) Rinse ready for later.
To test for Chelated Iron
1) take 5 ml water sample
2) Add 3 drops of reagent #1, cap & shake.
3) Add one level spoonful of reagent #2 (powder)
4) Cap & Shake
5) Wait 30 mins
Match colour to chart
7) Rinse tube ready for later.
Free Iron (Toxic) : 0 to 0.1 is ideal, any more and a water change is suggested.
Chelated Iron (for planted aquariums):
0 to 0.25 mg/L is too low
0.25 to 0.5 mg/L is ideal
any higher, partial water change is suggested.
I am paraphrasing all of this, but the amounts are as per the booklet.